It's true, Vance never became a John Campbell regular. But I was surprised to find that Vance did place at least five stories in Astounding, including his fourth published story:

1947 - I'll Build Your Dream Castle
1950 - The Potters of Firsk
1952 - Telek
1958 - The Miracle Workers
1959 - Dodkin's Job

At least two of these stories were featured in the cover illustration for that issue, and I am told that most of these stories placed at the top of the "Analytical Laboratory" reader's poll for the issues in which they appeared.